Hot air device

Abstract

Apply an arbitrary temperature gradient along the longitudinal direction of the nozzle. [Solution] A hot air device 10 blows hot air onto an object F from a nozzle 1 having a slit-shaped outlet 1a, comprising two inlet chambers 4 and 5 into which gases of different temperatures flow separately, a mixing chamber 6 that mixes the gases flowing in from the inlet chambers and supplies them to the nozzle, and a temperature gradient forming section 20 that can adjust the mixing ratio at the boundary between the inlet chamber and the mixing chamber to form an arbitrary temperature gradient along the longitudinal direction of the nozzle, the temperature gradient forming section having a plurality of mixing ratio setting sections 30 that are divided along the longitudinal direction of the nozzle and can change the mixing ratio.

Description

【Technical Field】 【0001】 The present invention relates to a hot air device. 【Background Art】 【0002】 There is a drying device disposed on the downstream side of a coating device that applies a liquid to a belt-like body, and dries the belt-like body by blowing hot air onto the belt-like body (for example, Patent Document 1). The hot air device of Patent Document 1 includes a slit-shaped nozzle that blows hot air along the width direction of the belt-like body toward the belt-like body. Further, the nozzle is supplied with a gas in which gases having different temperatures are mixed to give a temperature gradient in the width direction of the belt-like body. 【0003】 Here, in the mixing of gases (gases) having different temperatures, a temperature gradient imparting portion configured such that the total amount per unit of the high-temperature gas and the low-temperature gas is constant in the width direction by a linear shielding plate is described. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Publication No. 2020-143877 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 Patent Document 1 describes that the temperature gradient of the gas ejected from the nozzle is set to a profile along a proportional straight line by a temperature gradient imparting portion. However, this linear temperature gradient is a theoretical value. When the temperature gradient of the gas actually discharged from the nozzle is measured, the measured temperature gradient becomes a curve convex upward with respect to the proportional straight line. This is because when the temperature of the gas increases, the gas density ρ decreases, and if the pressure loss passing through the opening is constant, the flow velocity of the hot gas increases, so such a phenomenon occurs. 【0006】 Furthermore, while the nozzle discharges and heats up unheated materials such as films, the heat transfer coefficient of the surface is proportional to the 0.78 power of the airflow rate, so deviations in this airflow rate result in relatively large temperature differences. Therefore, the aforementioned tendency for the profile to be convex upwards is amplified. Note that this tendency cannot be adjusted in principle. 【0007】 The present invention has been made in view of the above circumstances, and aims to provide a hot air device that can adjust the temperature to any desired level in the width direction and apply any desired temperature gradient in the width direction, in a nozzle that mixes high-temperature gas and low-temperature gas to set the temperature. [Means for solving the problem] 【0008】 (1) A hot air device according to one aspect of the present invention is A hot air device equipped with a nozzle having a slit-shaped outlet for blowing out hot air, which blows hot air from the nozzle onto an object, Two air blowers that blow gases at different temperatures, Two separate inlet chambers into which the gas blown from each air outlet flows, A mixing chamber mixes the gases flowing in from each inlet chamber and supplies them to the nozzle, A temperature gradient forming unit is provided at the boundary between the inlet chamber and the mixing chamber, and is capable of adjusting the mixing ratio of the gas to form an arbitrary temperature gradient along the longitudinal direction of the nozzle. Equipped with, The temperature gradient forming unit is divided along the longitudinal direction of the nozzle and has a plurality of mixing ratio setting units that can change the mixing ratio. This resolved the above issues. (2) The hot air device of the present invention, in the above (1), The mixing ratio setting unit is a rotary cylinder having an axis along the longitudinal direction of the nozzle, The rotary cylinder has a shielding portion formed on its circumferential surface, As the rotary cylinder rotates, the shielding portion changes the opening area to the inlet chamber, thereby adjusting the degree of opening from the inlet chamber. It is possible. (3) The hot air device of the present invention, in the above (2), The rotary cylinders are arranged coaxially adjacent to each other along the longitudinal direction of the nozzle, and adjacent rotary cylinders are separated from each other by a partition wall. It is possible. (4) The hot air device of the present invention, in the above (2), The rotary cylinder has an opening degree adjustment means that allows the opening degree of each cylinder to be individually adjusted from outside the device. It is possible. (5) The hot air device of the present invention, in the above (2), The rotary cylinder has positioning means for individually defining the opening adjustment position. It is possible. (6) The hot air device of the present invention, in the above (2), At the outer circumference of the rotary cylinder, the two inlet chambers are in contact, the boundary wall between the two inlet chambers is formed from an insulating material, and there is a sealing portion that seals the boundary wall and the outer circumference of the rotary cylinder. It is possible. (7) The hot air device of the present invention, in the above (3), The mixing chamber is provided with an intermediate mixing partition wall, which is arranged parallel to the partition wall and spaced apart in the longitudinal direction of the nozzle, and which forms an intermediate temperature region that averages the mixing ratio with the adjacent rotary cylinder. It is possible. 【0009】 In the hot air device of the present invention, in the configuration of (1) above, the temperature gradient forming unit individually sets the mixing ratio of the gas for each region divided along the longitudinal direction of the nozzle using the mixing ratio setting unit, thereby enabling the formation of any temperature gradient along the longitudinal direction of the nozzle. This corrects the tendency of the temperature profile in which a linear temperature gradient becomes convex upward, which could not be corrected in the past, and makes it possible to form a substantially linear temperature gradient. 【0010】 In the hot air device of the present invention, in the configuration of (2) above, the rotation angle is set individually for each rotary cylinder arranged along the longitudinal direction of the nozzle. This changes the position of the shielding part in each rotary cylinder. Then, in one rotary cylinder, the area of ​​the inflow opening from the two inflow chambers changes depending on the rotation position of the shielding part. The mixing ratio of high-temperature gas and low-temperature gas can be determined by the rotation position of the shielding part. By setting a predetermined mixing ratio in one rotary cylinder and setting the mixing ratio for each of the multiple rotary cylinders arranged in a row, it is possible to set the temperature distribution along the longitudinal direction of the nozzle and form any temperature gradient along the longitudinal direction of the nozzle. In particular, by setting the opening of one inlet chamber to increase along the longitudinal direction of the nozzle for multiple rotary cylinders arranged along the longitudinal direction of the nozzle, a temperature gradient that rises in one direction and can be approximated as linear can be formed. 【0011】 In the hot air device of the present invention, in the configuration of (3) above, adjacent rotary cylinders are separated by a partition wall, so that the high-temperature gas and low-temperature gas flowing into the rotary cylinder from the two inlet chambers do not pass through the partition wall, and the ratio of high-temperature gas to low-temperature gas does not change. Therefore, the mixing ratio of high-temperature gas and low-temperature gas can be set independently in adjacent rotary cylinders separated by each partition wall, and the mixing ratio and temperature can be set independently for each region corresponding to the axial dimension of the rotary cylinder. The partition wall can be a disc perpendicular to the axial end face of the rotary cylinder, that is, perpendicular to the longitudinal direction of the nozzle. The partition wall can rotate integrally with the rotary cylinder. 【0012】 In the configuration of (4) above, the hot air device of the present invention allows the opening degree to be set by the opening degree adjustment means, which allows the rotary cylinder to rotate independently of the adjacent rotary cylinder. Specifically, as the opening degree adjusting means, each rotary cylinder can be configured to have a key groove formed on the inner circumference of an opening degree adjusting hole that opens concentrically with the center of the rotary cylinder, and an opening degree adjusting insertion rod portion having a key that engages with this key groove at its tip. The opening degree adjusting insertion rod portion can be inserted into the opening degree adjusting hole and the key can be engaged with the corresponding key groove to rotate a specific rotary cylinder and set the opening degree. Further, by moving the key along the key groove, the insertion position of the opening degree adjusting insertion rod portion in the opening degree adjusting hole can be changed, and the key can be engaged with the key groove corresponding to the rotary cylinder located further inside, or the key can be engaged with the key groove corresponding to the rotary cylinder at the pulled-out position. Thereby, only a specific rotary cylinder can be rotated by the opening degree adjusting insertion rod portion to adjust the opening degree. 【0013】 In the hot air device of the present invention, in the configuration of (5) above, when rotated independently of the adjacent rotary cylinder by the opening degree adjusting means, it is possible to position the rotary cylinder whose opening degree is set by the positioning means so that its rotational position does not fluctuate. Thereby, it becomes easy to perform independent opening degree setting in the adjacent rotary cylinders. Specifically, as the positioning means, it can be configured to have a positioning concave portion formed on the outer peripheral surface of the rotary cylinder and a positioning convex portion such as a ball plunger provided at a position supporting the rotary cylinder. A plurality of positioning concave portions are provided at intervals in the circumferential direction of the rotary cylinder, and the rotational position of the rotary cylinder can be positioned by fitting the positioning convex portion into this specific positioning concave portion. 【0014】 In the hot air blower of the present invention, in the configuration of (6) above, two of the inflow chambers are in contact with the outer periphery of the rotary cylinder, and a boundary wall serving as a boundary therebetween is provided outward in the radial direction of the rotary cylinder, and this boundary wall is sealed by a seal portion between the boundary wall and the outer periphery of the rotary cylinder. Thereby, even if the shielding portion of the rotary cylinder rotates with respect to the seal portion, the seal between the boundary wall and the outer periphery of the rotary cylinder is maintained. Further, since the boundary wall is formed of a heat insulating material, heat transfer between the two inflow chambers is prevented, and the temperature of the high-temperature gas and the low-temperature gas can be maintained while being mixed at a mixing ratio set by the opening degree of the rotary cylinder. As a result, it is possible to prevent the temperature set by the opening degree of the rotary cylinder from deviating, and to form a predetermined temperature profile. 【0015】 In the hot air blower of the present invention, in the configuration of (7) above, when different mixing ratios are set in adjacent rotary cylinders, the temperatures in the mixing chamber are different. Here, the gas flowing from each rotary cylinder into the mixing chamber is averaged by dividing the region from the rotary cylinder toward the nozzle in the axial direction of the rotary cylinder and mixing, thereby forming an intermediate temperature region. That is, in the axial direction of the rotary cylinder, it is possible to form an intermediate temperature region that is averaged by dividing the vicinity of the end portions at adjacent positions by an intermediate mixing partition wall and mixing with the gas flowing from the adjacent rotary cylinders into the mixing chamber. Thereby, in adjacent rotary cylinders, it is possible to form a temperature profile with a reduced axial change by an intermediate temperature region in which different temperature profiles are averaged. [Effect of the Invention] 【0016】 According to the present invention, it is possible to provide a hot air blower capable of imparting an arbitrary temperature gradient in the longitudinal direction of the nozzle by arranging a plurality of rotary cylinders and setting the temperature for each cylinder. [Brief Description of the Drawings] 【0017】 [Figure 1] This is a perspective view showing a first embodiment of the hot air device according to the present invention. [Figure 2] This figure (a) is a schematic top view showing the temperature gradient forming section in the first embodiment of the hot air device according to the present invention, and (b) is a figure showing the corresponding temperature profile. [Figure 3] This is a schematic cross-sectional view showing the mixing ratio setting section in the first embodiment of the hot air device according to the present invention. [Figure 4] This is a schematic perspective view showing the mixing ratio setting unit and the opening degree adjustment means in a first embodiment of the hot air device according to the present invention. [Figure 5] This is a partial side view showing the positioning means in a first embodiment of the hot air device according to the present invention. [Figure 6] This is a schematic top view (a) showing another opening degree of the temperature gradient forming section in the first embodiment of the hot air device according to the present invention, and a diagram (b) showing the corresponding temperature profile. [Figure 7] This is a schematic side view showing a temperature gradient forming section and an intermediate mixing partition in a second embodiment of the hot air device according to the present invention. [Figure 8] This figure (a) is a schematic top view showing a temperature gradient forming section and an intermediate mixing partition in a second embodiment of the hot air device according to the present invention, and (b) is a figure showing the corresponding temperature profile. [Figure 9] This is a schematic top view (a) showing another opening degree of the temperature gradient forming section in a second embodiment of the hot air device according to the present invention, and a diagram (b) showing the corresponding temperature profile. [Modes for carrying out the invention] 【0018】 A first embodiment of the hot air device according to the present invention will be described below with reference to the drawings. Figure 1 is a perspective view showing the hot air device in this embodiment. Figure 2 is a schematic top view (a) showing the temperature gradient forming section in this embodiment. Figure 3 is a schematic cross-sectional view showing the mixing ratio setting section in this embodiment. In the figures, reference numeral 10 denotes the hot air device. The X, Y, and Z directions are mutually orthogonal. 【0019】 As shown in Figure 1, the hot air device 10 according to this embodiment is a device that dries or heat-treats a sheet-like film (strip-shaped body) F by blowing hot air onto the film F. In this case, the hot air device 10 may also be capable of forming a predetermined temperature gradient on the film F and stretching the film F in a predetermined direction. 【0020】 As shown in Figures 1 to 3, the hot air device 10 includes a heating nozzle (nozzle) 1, a high-temperature gas supply unit (first air blowing unit) 2, a low-temperature gas supply unit (second air blowing unit) 3, a high-temperature gas chamber (first inlet chamber) 4, a low-temperature gas chamber (second inlet chamber) 5, a mixing chamber 6, a temperature detection unit 15, and a temperature gradient forming unit 20. The hot air device 10 can dry the liquid applied to the film F by blowing hot air from the heating nozzle 1. 【0021】 The film F is, for example, a strip of metal foil, film, paper, cloth, ceramic, etc. The film F is conveyed in the longitudinal direction Fa. The conveying means for the film F can be a plurality of conveying rollers arranged spaced apart in the longitudinal direction Fa. The conveying means is not particularly limited. The longitudinal direction Fa is shown as the Y direction. The heating nozzle (nozzle) 1 blows hot air toward the film F. The heating nozzle 1's longitudinal direction is perpendicular to the width direction of the film F, which is perpendicular to the transport direction Fa of the film F. The ejection direction of the heating nozzle 1 is the Z direction. The longitudinal direction of the heating nozzle 1 is the X direction. The heating nozzle 1 is connected to the mixing chamber 6. The outlet 1a of the nozzle 1 is formed in a slit shape when viewed in the Z direction. 【0022】 The temperature detection unit 15 is located near the outlet 1a of the nozzle 1. The temperature detection unit 15 is positioned in accordance with the rotary cylinder 30, which will be described later. Specifically, the temperature detection unit 15 can be positioned near the center of the rotary cylinder 30 in the X direction, directly above the outlet 1a of the nozzle 1. The temperature detection unit 15 measures the temperature of the gas ejected from the nozzle 1. The temperature detection unit 15 can be, for example, a thermocouple. 【0023】 The high-temperature gas supply unit 2 is connected to the high-temperature gas chamber (first inlet chamber) 4. The high-temperature gas supply unit 2 has a first fan, such as a turbo fan or a sirocco fan, and is capable of supplying gas to the high-temperature gas chamber 4. The high-temperature gas supply unit 2 has a first temperature adjustment means, such as a heater, and is capable of setting the temperature of the gas supplied to the high-temperature gas chamber 4. The high-temperature gas supply unit 2 supplies gas at a higher temperature than the low-temperature gas supply unit 3. 【0024】 The low-temperature gas supply unit 3 is connected to the low-temperature gas chamber (second inlet chamber) 5. The low-temperature gas supply unit 3 has a second fan, such as a turbo fan or a sirocco fan, and is capable of supplying gas to the low-temperature gas chamber 5. The low-temperature gas supply unit 3 has a second temperature adjustment means, such as a heater, and is capable of setting the temperature of the gas supplied to the low-temperature gas chamber 5. The low-temperature gas supply unit 3 supplies gas at a lower temperature than the high-temperature gas supply unit 2. 【0025】 The high-temperature gas chamber (first inlet chamber) 4 is supplied with high-temperature gas from the high-temperature gas supply unit 2. The high-temperature gas chamber 4 extends in the X direction. The X-direction length of the high-temperature gas chamber 4 corresponds to the X-direction length of the heating nozzle 1. The low-temperature gas chamber (second inlet chamber) 5 is supplied with low-temperature gas from the low-temperature gas supply unit 3. The low-temperature gas chamber 5 extends in the X direction. The X-direction length of the low-temperature gas chamber 5 corresponds to the X-direction length of the heating nozzle 1. The length of the high-temperature gas chamber 4 in the X direction is equal to the length of the low-temperature gas chamber 5 in the X direction. 【0026】 The high-temperature gas chamber 4 and the low-temperature gas chamber 5 are located adjacent to each other in the Y direction. The high-temperature gas chamber 4 and the low-temperature gas chamber 5 are at the same height relative to each other in the Z direction. The high-temperature gas chamber 4 and the low-temperature gas chamber 5 are separated in the Y direction by a lower boundary wall (boundary wall) 11. The lower boundary wall 11 is made of insulating material. The lower boundary wall 11 is erected in the Z direction. The lower boundary wall 11 extends in the X direction. The high-temperature gas chamber 4 and the low-temperature gas chamber 5 are adjacent to each other, with a mixing chamber 6 positioned in the Z-direction, approaching the heating nozzle 1. 【0027】 The high-temperature gas chamber 4 and the mixing chamber 6 are separated in the Z direction by an intermediate boundary wall (boundary wall) 12. The intermediate boundary wall 12 is arranged along the XY plane. The intermediate boundary wall 12 may be made of insulating material. The intermediate boundary wall 12 extends in the X direction. The low-temperature gas chamber 5 and the mixing chamber 6 are separated in the Z direction by an intermediate boundary wall (boundary wall) 13. The intermediate boundary wall 13 is arranged along the XY plane. The intermediate boundary wall 13 may be made of insulating material. The intermediate boundary wall 13 extends in the X direction. 【0028】 The intermediate boundary wall 12 and the intermediate boundary wall 13 can be formed flush with each other. The sum of the Y-direction dimension of the high-temperature gas chamber 4 and the Y-direction dimension of the low-temperature gas chamber 5 can be equal to the Y-direction dimension of the mixing chamber 6. The lower boundary wall 11, the intermediate boundary wall 12, and the intermediate boundary wall 13 intersect each other on a straight line extending in the X direction. The high-temperature gas chamber 4, the low-temperature gas chamber 5, and the mixing chamber 6 all have the same dimension in the X direction. A temperature gradient forming section 20 is positioned at the boundary between the high-temperature gas chamber 4, the low-temperature gas chamber 5, and the mixing chamber 6. 【0029】 The temperature gradient forming section 20 extends in the X direction. The temperature gradient forming section 20 mixes the gases supplied from the high-temperature gas chamber 4 and the low-temperature gas chamber 5 at a predetermined mixing ratio. The temperature gradient forming section 20 supplies the gas with a predetermined temperature gradient formed by the mixed gases to the mixing chamber 6. The temperature gradient forming section 20 is capable of forming a predetermined temperature profile in the X direction. The gas supplied from the temperature gradient forming section 20 to the mixing chamber 6 is ejected from the nozzle 1 while maintaining the predetermined temperature gradient. 【0030】 The length of the temperature gradient forming section 20 in the X direction corresponds to the length of the heating nozzle 1 in the X direction. The temperature gradient forming section 20 has a substantially circular YZ cross-section. The central axis of the temperature gradient forming section 20 coincides with the boundary line between the high-temperature gas chamber 4, the low-temperature gas chamber 5, and the mixing chamber 6. The central axis of the temperature gradient forming section 20 coincides with the straight line where the extended planes of the lower boundary wall 11, the intermediate boundary wall 12, and the intermediate boundary wall 13 intersect. 【0031】 The temperature gradient forming section 20 and the lower boundary wall 11 are in contact via the lower seal section (seal section) 7. The temperature gradient forming section 20 and the lower boundary wall 11 are sealed by the lower seal section 7. The temperature gradient forming section 20 and the intermediate boundary wall 12 are in contact via the intermediate seal section (seal section) 8. The temperature gradient forming section 20 and the intermediate boundary wall 12 are sealed by the intermediate seal section 8. The temperature gradient forming section 20 and the intermediate boundary wall 13 are in contact via the intermediate seal section (seal section) 9. The temperature gradient forming section 20 and the intermediate boundary wall 13 are sealed by the intermediate seal section 9. 【0032】 The lower seal portion 7, the intermediate seal portion 8, and the intermediate seal portion 9 are in contact with the entire length of the temperature gradient forming portion 20 in the X direction. The lower seal portion 7, the intermediate seal portion 8, and the intermediate seal portion 9 maintain their contact and sealing state even when the rotary cylinder 30, which will be described later, rotates. The temperature gradient forming section 20 is divided in the X direction. The temperature gradient forming section 20 has a plurality of mixing ratio setting sections 30. 【0033】 Figure 4 is a perspective view showing the mixing ratio setting unit and the opening degree adjustment means in this embodiment. The mixing ratio setting unit 30 is arranged adjacent to each other in the X direction. The mixing ratio setting unit 30 is a rotary cylinder. The rotary cylinder 30 has a substantially circular YZ cross-section. The central axis of the rotary cylinder 30 is aligned with the X direction. The central axis of the rotary cylinder 30 coincides with the boundary line between the high-temperature gas chamber 4, the low-temperature gas chamber 5, and the mixing chamber 6. The central axis of the rotary cylinder 30 coincides with the straight line where the extended planes of the lower boundary wall 11, the intermediate boundary wall 12, and the intermediate boundary wall 13 intersect. 【0034】 The rotary cylinder 30 has partition walls (top plates) 31 located at both ends in the X direction, a rim portion 32 formed along the edge of the partition wall 31, spoke portions 33 extending radially inward from the rim portion 32, a central portion 34 to which the radially inward portions of the spoke portions 33 are connected, a connecting portion 35 connecting the spoke portions 33 in the X direction, and a shielding portion 36. The partition wall 31 is provided across the entire surface of the X-direction end of the rotary cylinder 30. The partition wall 31 has a circular contour when viewed in the X direction. The partition wall 31 is perpendicular to the axis of the rotary cylinder 30. The partition wall 31 is aligned with the YZ plane. Note that the partition wall 31 on the right side is omitted in Figure 4. 【0035】 The rim portion 32 is formed around the entire edge of the partition wall 31. The rim portion 32 has a predetermined length dimension in the X direction. The X-direction dimension of the rim portion 32 is uniform in the circumferential direction. A positioning recess 32d, which will be described later, is formed on the outer circumferential surface of the rim portion 32. The spokes 33 are formed along the partition wall 31. Although four spokes 33 are shown in the illustration, the number is not limited to these. The spokes 33 are spaced equally in the circumferential direction. The outer ends of the spokes 33 are connected to the rim 32. The inner ends of the spokes 33 are connected to the center 34. 【0036】 The rim portion 32 is in contact with the lower seal portion 7, the intermediate seal portion 8, and the intermediate seal portion 9. The rim portion 32 is rotatable relative to the lower seal portion 7, the intermediate seal portion 8, and the intermediate seal portion 9. The rotary cylinder 30 is supported in the Z direction by the contact between the rim portion 32 and the lower seal portion 7. The rotary cylinder 30 is supported in the Y direction by the contact between the rim portion 32 and the intermediate seal portions 8 and 9. 【0037】 The central part 34 is formed in a tubular shape. The central part 34 is coaxial with the rim part 32. The central part 34 is tapered in diameter at both ends in the X direction. The shape of the central part 34 differs at both ends in the X direction. An opening adjustment hole 34a is formed at the central end 34A located on the right side of Figure 4. An insertion guide hole 34b is formed at the central end 34B located on the left side of Figure 4. The opening adjustment hole 34a and the insertion guide hole 34b are coaxial. The opening adjustment hole 34a and the insertion guide hole 34b are coaxial with the axis of the rotary cylinder 30. 【0038】 A keyway 34k extending in the X direction is formed on the inner surface of the opening adjustment hole 34a. The diameter of the insertion guide hole 34b is larger than the diameter of the opening adjustment hole 34a. The diameter of the insertion guide hole 34b is equal to or slightly larger than the sum of the diameter of the opening adjustment hole 34a and the radial depth of the keyway 34k. The partition wall 31 is open at the positions corresponding to the opening adjustment hole 34a and the insertion guide hole 34b. 【0039】 The central section 34 is pipe-shaped with its axis in the X direction. The central ends 34A and 34B of the central section 34 are both connected to the partition walls 31 at both ends in the X direction of the rotary cylinder 30. The outer diameter of the central section 34 is equal along its entire length in the X direction. The central part 34 has a uniform inner diameter along its entire length in the X direction, except for the central ends 34A and 34B. In the central part 34, the inner diameters other than those of the central ends 34A and 34B are larger than the diameters of the opening adjustment hole 34a and the insertion guide hole 34b. The inner diameters of the central part 34 other than those of both ends 34A and 34B are set such that the tip 41 of the opening adjustment means 40 (described later) and the setting key 41k can move in the X direction without contacting the inner surface of the central part 34. 【0040】 The tubular central part 34 separates its interior from the internal space of the rotary cylinder 30, which is located outside the central part 34. The interior of the central part 34 communicates with the outside through the opening adjustment hole 34a and the insertion guide hole 34b. The interior of the central part 34 does not communicate with the internal space of the rotary cylinder 30, which is located outside the central part 34. The central part 34 is sealed from the internal space of the rotary cylinder 30 to prevent high-temperature and low-temperature gases from leaking to the outside through the opening adjustment hole 34a and the insertion guide hole 34b. 【0041】 Furthermore, the partition wall 31 has portions that pass through it in the X direction, corresponding to the opening adjustment holes 34a and insertion guide holes 34b, which are at both ends of the rotary cylinder 30. Furthermore, the opening adjustment hole 34a and the insertion guide hole 34b, which are at both ends of the temperature gradient forming section 20 in the X direction, are each provided with covers. 【0042】 In all of the rotary cylinders 30, the positional relationship between the opening adjustment hole 34a and the insertion guide hole 34b in the X direction is the same. In other words, in rotary cylinders 30 adjacent to each other in the X direction, the opening adjustment hole 34a and the insertion guide hole 34b are adjacent to each other. 【0043】 The shielding portion 36 has an outer peripheral shielding portion 36a, a radial shielding portion 36b, and a radial shielding portion 36c. The outer peripheral shielding portion 36a is formed on the outer peripheral surface of the rotary cylinder 30. The outer peripheral shielding portion 36a covers the entire length of the outer peripheral surface of the rotary cylinder 30 in the X direction. The outer peripheral shielding portion 36a covers a portion of the outer peripheral surface of the rotary cylinder 30 in the circumferential direction. When viewed in the X direction, the outer peripheral shielding portion 36a is formed along the outer peripheral surface of the rotary cylinder 30 so as to connect the lower boundary wall 11 and the intermediate boundary wall 12, or the lower boundary wall 11 and the intermediate boundary wall 13 (see Figure 3). 【0044】 The circumferential position of the outer peripheral shielding portion 36a relative to the axis of the rotary cylinder 30 is precisely set with respect to the angle of the keyway 34k formed on the inner circumference of the opening adjustment hole 34a. In other words, the angle around the axis of the rotary cylinder 30 is such that the position of the keyway 34k and the area covered by the outer peripheral shielding portion 36a coincide for all rotary cylinders 30. Therefore, when the keyway 34k is set to a predetermined rotational position, the rotational position of the outer peripheral shielding portion 36a becomes the same for all rotary cylinders 30. 【0045】 In other words, the outer peripheral shielding portion 36a is formed in an arc shape connecting the lower sealing portion 7 and the intermediate sealing portion 8, and an arc shape connecting the lower sealing portion 7 and the intermediate sealing portion 9, when viewed in the X direction. The radial shielding portion 36b and the radial shielding portion 36c are connected to the circumferential end of the outer peripheral shielding portion 36a. The radial shielding portion 36b and the radial shielding portion 36c are formed in a substantially straight line when viewed in the X direction. 【0046】 As the rotary cylinder 30 rotates, the outer peripheral shielding portion 36a moves relative to the lower seal portion 7. Even as the rotary cylinder 30 rotates, the outer peripheral shielding portion 36a does not move away from the lower seal portion 7. Even as the rotary cylinder 30 rotates, the outer peripheral shielding portion 36a remains in contact with the lower seal portion 7. The lower seal portion 7, the intermediate seal portion 8, and the intermediate seal portion 9 restrict the position of the rotary cylinder 30 so that its axis does not shift even as the rotary cylinder 30 rotates. 【0047】 When the rotary cylinder 30 is rotating to the position shown in Figure 3(b), the outer peripheral shield 36a contacts the lower seal portion 7 and the intermediate seal portion 9. At this time, the space between the lower seal portion 7 and the intermediate seal portion 9 is closed by the outer peripheral shield 36a. Simultaneously, the space between the lower seal portion 7 and the intermediate seal portion 8 is not closed by the outer peripheral shield 36a. In other words, the inside of the rotary cylinder 30 is open to the high-temperature gas chamber 4. High-temperature gas flows into the inside of the rotary cylinder 30 from the high-temperature gas chamber 4, as indicated by the arrow Hi in Figure 3(b). 【0048】 As the rotary cylinder 30 rotates clockwise, at the position shown in Figure 3(a), the outer peripheral shielding portion 36a is in contact with the lower seal portion 7. At this time, the outer peripheral shielding portion 36a is not in contact with the intermediate seal portion 8 and the intermediate seal portion 9. In other words, the space between the lower seal portion 7 and the intermediate seal portion 8 is not blocked by the outer peripheral shielding portion 36a. The space between the lower seal portion 7 and the intermediate seal portion 9 is not blocked by the outer peripheral shielding portion 36a. In other words, the inside of the rotary cylinder 30 is open to the high-temperature gas chamber 4 and the low-temperature gas chamber 5. In the inside of the rotary cylinder 30, as indicated by arrow Hi in Figure 3(a), high-temperature gas flows in from the high-temperature gas chamber 4, and as indicated by arrow Lo, low-temperature gas flows in from the low-temperature gas chamber 5. 【0049】 Furthermore, as the rotary cylinder 30 rotates clockwise, the outer peripheral shield 36a comes into contact with the lower seal portion 7 and the intermediate seal portion 8. At this time, the space between the lower seal portion 7 and the intermediate seal portion 8 is closed by the outer peripheral shield 36a. Simultaneously, the space between the lower seal portion 7 and the intermediate seal portion 9 is not closed by the outer peripheral shield 36a. In other words, the inside of the rotary cylinder 30 is open to the low-temperature gas chamber 5. Low-temperature gas flows into the inside of the rotary cylinder 30 from the low-temperature gas chamber 5, similar to the arrow Lo shown in Figure 3(a). 【0050】 Thus, the opening area to the high-temperature gas chamber 4 and the low-temperature gas chamber 5 changes depending on the rotational position of the rotary cylinder 30. In other words, the degree of opening to the high-temperature gas chamber 4 and the low-temperature gas chamber 5 can be changed by the rotational position of the rotary cylinder 30. The mixing ratio of high-temperature gas and low-temperature gas flowing from the high-temperature gas chamber 4 and the low-temperature gas chamber 5 into the rotary cylinder 30 changes depending on the rotational position of the rotary cylinder 30. Here, the rotary cylinders 30, which are arranged in a row in the X direction, constitute the temperature gradient forming section 20. In the temperature gradient forming section 20, the mixing ratio of high-temperature gas and low-temperature gas in the X direction can be set by setting the opening degree of each rotary cylinder 30. The temperature gradient forming unit 20 can set the temperature distribution to have a predetermined temperature profile in the X direction. 【0051】 As shown in Figure 4, the hot air device 10 has an opening degree adjustment means 40. The opening degree adjustment means 40 includes a tip portion 41, a setting key 41k, an opening degree adjustment insertion rod portion 42, a handle portion 43, a rotation angle indicator portion (scale portion) 44a, and an insertion position indicator portion (scale portion) 44b. 【0052】 The opening degree adjustment means 40 has a rod-shaped opening degree adjustment insertion rod portion 42, with an enlarged tip portion 41 at its end. The tip of the tip portion 41 is pointed. The external dimensions of the tip portion 41 are smaller than the diameter of the insertion guide hole 34b and the same as or slightly smaller than the diameter of the opening degree adjustment hole 34a. A setting key 41k that protrudes radially outward is provided on the outer circumferential surface of the tip portion 41. The opening degree adjustment insertion rod portion 42 has an X-direction dimension that is approximately the same as or greater than that of the temperature gradient forming portion 20. The opening degree adjustment insertion rod portion 42 can be inserted into the temperature gradient forming portion 20. Furthermore, the opening degree adjustment insertion rod portion 42 can be withdrawn from the temperature gradient forming portion 20 and separated from it. 【0053】 The setting key 41k has approximately the same outer diameter as the keyway 34k. The setting key 41k is insertable into the keyway 34k. The setting key 41k is movable in the X direction inside the keyway 34k. When the setting key 41k is inserted into the keyway 34k, the rotary cylinder 30 can be rotated when the opening adjustment insertion rod 42 is rotated. The radial projection dimension of the setting key 41k relative to the axis of the opening adjustment insertion rod portion 42 is set so that it can pass through the insertion guide hole 34b. The sum of the radial projection dimensions of the tip portion 41 and the setting key 41k is set to be smaller than the diameter of the insertion guide hole 34b. 【0054】 The handle portion 43 protrudes radially outward so as to intersect with the axis of the opening degree adjustment insertion rod portion 42. When the handle portion 43 is rotated around the axis of the opening degree adjustment insertion rod portion 42, the opening degree adjustment insertion rod portion 42 rotates around the axis. When the handle portion 43 is rotated around the axis of the opening degree adjustment insertion rod portion 42, the setting key 41k rotates around the axis of the opening degree adjustment insertion rod portion 42. The rotation angle indicator 44a is positioned near the handle portion 43. The rotation angle indicator 44a can indicate the rotation angle of the handle portion 43 around the X axis. The rotation angle indicator 44a has a scale for indicating the rotation angle. 【0055】 The insertion position indicator section 44b is positioned to extend along the opening degree adjustment insertion rod section 42. The insertion position indicator section 44b has a scale that indicates the insertion depth (insertion distance) of the opening degree adjustment insertion rod section 42 inserted into the temperature gradient forming section 20. The insertion position indicator section 44b can indicate the position in which the setting key 41k is inserted into the keyway 34k of each rotary cylinder 30. The keyway 34k constitutes the opening degree adjustment means 40. 【0056】 When the keyway 34k is set to a predetermined rotation position indicated by the rotation angle indicator 44a using the opening adjustment means 40, the rotation position of the keyway 34k corresponds to the rotation position of the outer peripheral shielding portion 36a, so all rotary cylinders 30 can be set to the predetermined rotation position. In this way, by setting the insertion position of the opening adjustment means 40 in the X direction relative to the temperature gradient forming part 20, the rotation angle can be set individually for all rotary cylinders 30. Furthermore, since the rotation of each rotary cylinder 30 is restricted by the positioning means 50 described later, only the rotary cylinder 30 in which the setting key 41k is inserted into the keyway 34k can be rotated. 【0057】 Figure 5 is a partial side view showing the positioning means in this embodiment. As shown in Figure 5, the hot air device 10 has a positioning means 50. The positioning means 50 has a positioning recess 32d and a positioning protrusion 7d. The positioning recess 32d is a recess formed on the outer circumference of the rim portion 32. Multiple positioning recesses 32d are formed on the outer circumference of the rim portion 32, spaced apart in the circumferential direction. The positioning recesses 32d are formed in a range corresponding to the outer peripheral shielding portion 36a. In other words, when viewed in the X direction, the positioning recesses 32d are formed in a range that overlaps with the outer peripheral shielding portion 36a. 【0058】 The positioning projection 7d is provided on the lower seal portion 7. The positioning projection 7d protrudes upward in the Z direction from the lower seal portion 7. The positioning projection 7d engages with the positioning recess 32d. The positioning projection 7d is, for example, a ball plunger. The positioning projection 7d and the positioning recess 32d engage to define the rotational position of the rotary cylinder 30. When the opening adjustment insertion rod 42 is rotated while inserted into the keyway 34k, the engagement between the positioning projection 7d and the positioning recess 32d is released, and the positioning projection 7d engages with the adjacent positioning recess 32d. The positioning means 50 defines the rotational position of the rotary cylinder 30. By setting a small distance between the positioning recesses 32d that are spaced apart along the circumferential direction of the outer circumference of the rim portion 32, the rotational position of the rotary cylinder 30 can be precisely set. 【0059】 In this embodiment, the hot air device 10 sets the rotational position of the rotary cylinder 30 using the opening degree adjustment means 40. As shown in Figure 4, the opening degree adjustment means 40 inserts its tip 41 in the X direction through the insertion guide hole 34b. The setting key 41k and tip 41 pass through the insertion guide hole 34b. The setting key 41k and tip 41 move in the X direction inside the central part 34. Furthermore, when the opening degree adjustment means 40 is inserted, the setting key 41k becomes engaged with the keyway 34k as indicated by the insertion position indicator 44b. In this state, the handle part 43 is rotated to the rotational position indicated by the rotation angle indicator 44a. Then the rotary cylinder 30 rotates, and the outer peripheral shielding part 36a becomes a predetermined rotational position. The opening degree of the rotary cylinder 30 is set. The rotational position of the rotary cylinder 30 is maintained by the positioning means 50. 【0060】 Once the opening angle of the rotary cylinder 30 has been set, the opening angle adjustment means 40 is then inserted toward the rotary cylinder 30 at the rear in the X direction. The above procedure is repeated to set the opening angle of all rotary cylinders 30 in the temperature gradient forming section 20. Once the opening angle setting for all rotary cylinders 30 is complete, the setting key 41k is pulled out while checking that the rotation angle of each rotary cylinder 30 is at the predetermined angle. After removing the setting key 41k from the opening adjustment hole 34a and insertion guide hole 34b of the central part 34, close the lid to complete the setting. Note that the partition wall 31 maintains separation between adjacent rotary cylinders 30, preventing the mixing of gases at their respective temperatures. 【0061】 Figure 2 shows an example of the state in the hot air device 10 where the opening degree settings for all rotary cylinders 30 have been completed. As shown in Figure 2(a), by setting the opening degree of each rotary cylinder 30, the mixing ratio of high-temperature gas and low-temperature gas in each rotary cylinder 30 can be set. Here, the opening degree of the rotary cylinder 30 is schematically shown. This sets the temperature profile in the X direction in the temperature gradient forming section 20, as shown in Figure 2(b). In this example, the temperature profile rises in a step-like manner from left to right. Here, since each rotary cylinder 30 is separated in the X direction by the partition wall 31, the mixed gas does not mix between adjacent rotary cylinders 30. Therefore, individual temperature states can be set in the X direction for each rotary cylinder 30, corresponding to the length of the rotary cylinder 30 in the X direction. 【0062】 The gas having a predetermined temperature profile formed in the temperature gradient forming unit 20 is supplied to the mixing chamber 6 and ejected from the nozzle 1 while maintaining the temperature profile in the X direction. This allows for the application of warm air to the film F while maintaining a consistent temperature profile in the X direction, enabling heat treatment such as drying. This is particularly useful when performing oblique stretching on the film F, as it allows for more precise temperature control. 【0063】 Therefore, while observing the temperature of the nozzle 1 measured by the temperature detection unit 15, the mixing ratio in the region separated for each rotary cylinder 30 can be changed from outside the hot air device 10 using the opening adjustment means 40. This allows the temperature distribution in the X direction to be freely set for each separated region. This makes it possible to set the amount of heat transferred to the film F to be, for example, linearly proportional. 【0064】 In conventional technology, the greater the temperature difference (step) set in the X direction, the greater the tendency for the curve to deviate from the theoretical straight line and become convex upwards. However, in this embodiment, all such tendencies can be corrected by adjusting the rotary cylinder 30. 【0065】 Figure 6(a) shows the state with a different opening angle setting. In this example, the opening angle of the leftmost rotary cylinder 30 is different from the example shown in Figure 2(a). This sets the temperature profile in the X direction in the temperature gradient forming section 20, as shown in Figure 6(b). In this example, except for the leftmost end, the temperature profile rises in a step-like manner from left to right. 【0066】 Similarly in this example, the gas having a predetermined temperature profile formed in the temperature gradient forming unit 20 is supplied to the mixing chamber 6 and ejected from the nozzle 1 while maintaining the temperature profile in the X direction. This allows for the application of hot air, maintaining a temperature profile in the X direction, to the film F, enabling heat treatment such as drying. 【0067】 A second embodiment of the hot air device according to the present invention will be described below with reference to the drawings. Figure 7 is a schematic side view showing the temperature gradient forming section and intermediate mixing partition in this embodiment. Figure 8 is a schematic top view (a) showing the temperature gradient forming section and intermediate mixing partition in this embodiment. In this embodiment, the difference from the first embodiment described above is in the intermediate mixing partition; other components corresponding to the first embodiment described above are denoted by the same reference numerals and their descriptions are omitted. 【0068】 In this embodiment, as shown in Figures 7 and 8(a), a plurality of intermediate mixing partitions 61 are provided in the mixing chamber 6. The intermediate mixing partition 61 is provided in the mixing chamber 6. The intermediate mixing partition 61 is formed along the YZ plane. The intermediate mixing partition 61 is parallel to the partition 31. The intermediate mixing partition 61 is positioned close to the center from the X-direction end of the rotary cylinder 30. The intermediate mixing partition 61 is positioned in two locations in the X-direction relative to the rotary cylinder 30. The intermediate mixing partition 61 separates the mixing chamber 6 in the X-direction. In the X direction, the area between the intermediate mixing partition 61 and the partition 31 is the intermediate mixing region (intermediate temperature region) 66. Inside the rotary cylinder 30, the area sandwiched between the two intermediate mixing partitions 61 in the X direction is the set mixing region 39. The intermediate mixing region 66 and the set mixing region 39 are arranged alternately in the X direction. 【0069】 The intermediate mixing partition 61 is provided along the YZ plane throughout the entire mixing chamber 6. Therefore, in the intermediate mixing region 66 between the intermediate mixing partition 61 and the partition 31, the high-temperature gas and low-temperature gas mixed in the adjacent rotary cylinder 30 will mix further. In addition, the gases will not mix between the intermediate mixing region 66 and the set mixing region 39. 【0070】 In the hot air device 10 of this embodiment, as in the first embodiment, the opening degree of each rotary cylinder 30 is set, and a predetermined temperature profile in the X direction is set. This sets the temperature profile in the X direction in the temperature gradient forming section 20, as shown in Figure 8(b). In this example, the temperature profile rises in a step-like manner from left to right. 【0071】 Here, in the X direction, the distance X66 between the intermediate mixing partition 61 and the partition 31 is set to half the distance X39 between the intermediate mixing partition 61 and the intermediate mixing partition 61. In other words, the X-direction length X39 of the set mixing region 39 is twice the X-direction length X66 of the intermediate mixing region 66. Consequently, the gas flowing into the intermediate mixing region 66 will have the same flow rate when adjacent rotary cylinders 30 are set to different opening degrees. Therefore, as shown in Figure 8(b), when the temperature of the mixed gas in the set mixing region 39 of adjacent rotary cylinders 30 is set to N°C and M°C, the temperature of the mixed gas in the intermediate mixing region 66 located between these set mixing regions 39 will be averaged to (N+M) / 2°C. Therefore, in this embodiment, it is possible to set a temperature profile with a smaller step difference compared to the first embodiment shown in Figure 2(b). 【0072】 Figure 9(a) shows the state with a different opening angle setting. In this example, the opening angle of the leftmost rotary cylinder 30 is different from the example shown in Figure 7(a). This sets the temperature profile in the X direction in the temperature gradient forming section 20, as shown in Figure 9(b). In this example, except for the leftmost end, the temperature profile rises in a step-like manner from left to right. 【0073】 Similarly, in this example, the gas having a predetermined temperature profile formed in the temperature gradient forming unit 20 is supplied to the mixing chamber 6 and ejected from the nozzle 1 while maintaining the temperature profile in the X direction. In this example as well, a temperature profile with a smaller step can be set compared to the example in Figure 6(b). This allows for the application of hot air, maintaining a temperature profile in the X direction, to the film F, enabling heat treatment such as drying. 【0074】 In this embodiment, the same effects as those of the above-described embodiment can be achieved. 【0075】 Furthermore, in the present invention, it is also possible to individually select and combine each of the configurations in the above-described embodiments. 【0076】 In the second embodiment, the length in the X direction of the rotary cylinders 30 at both ends in the X direction can be set to, for example, 3 / 4 times that of the other rotary cylinders 30. This makes it possible to achieve a temperature profile that is closer to a straight line in the X direction when setting the temperature profile shown in Figure 8(b). [Explanation of Symbols] 【0077】 10…Hot air device 1…Heating nozzle (nozzle) 1a...Air outlet 2…High-temperature gas supply unit (first air blowing unit) 3…Low-temperature gas supply unit (second air blower unit) 4…High-temperature gas chamber (first inlet chamber, inlet chamber) 5…Cryogenic gas chamber (first inlet chamber, inlet chamber) 6…Mixing chamber 7…Lower seal section (seal section) 7d...Positioning protrusion 8,9...Intermediate sealing section (sealing section) 11…Lower boundary wall (boundary wall) 12, 13… Intermediate boundary wall (boundary wall) 15...Temperature detection unit 20...Temperature gradient forming section 30... Rotary cylinder (mixing ratio setting unit) 31…Partition (top panel) 32d…Positioning recess 34…Center 34a...Opening adjustment hole 34b…Insertion guide port 34k... keyway 36…Shielding part 36a…Outer shielding part 36b, 36c...Radial shielding part 39…Setting mixed area 40...Opening adjustment means 41...Tip 41k...Setting key 42...Opening angle adjustment insertion rod section 43...Handle section 44a...Rotation indicator section (scale section) 44b... Insertion position indicator (scale) 50…Positioning means 61…Intermediate mixing bulkhead 66…Intermediate mixing area (intermediate temperature area) F... Film (a strip-like object; the subject)

Claims

[Claim 1] A hot air device equipped with a nozzle having a slit-shaped outlet for blowing out hot air, which blows hot air from the nozzle onto an object, Two air blowers that blow gases at different temperatures, Two separate inlet chambers into which the gas blown from each air blower flows, A mixing chamber mixes the gases flowing in from each inlet chamber and supplies them to the nozzle, A temperature gradient forming unit is provided at the boundary between the inlet chamber and the mixing chamber, and is capable of adjusting the mixing ratio of the gas to form an arbitrary temperature gradient along the longitudinal direction of the nozzle. Equipped with, The temperature gradient forming unit is divided along the longitudinal direction of the nozzle and has a plurality of mixing ratio setting units that can change the mixing ratio. Hot air device. [Claim 2] The mixing ratio setting unit is a rotary cylinder having an axis along the longitudinal direction of the nozzle, The rotary cylinder has a shielding portion formed on its circumferential surface, As the rotary cylinder rotates, the shielding portion changes the opening area to the inlet chamber, thereby adjusting the degree of opening from the inlet chamber. The hot air device according to claim 1. [Claim 3] The rotary cylinders are arranged coaxially adjacent to each other along the longitudinal direction of the nozzle, and adjacent rotary cylinders are separated from each other by a partition wall. The hot air device according to claim 2. [Claim 4] The rotary cylinder has an opening degree adjustment means that allows the opening degree of each cylinder to be individually adjusted from outside the device. The hot air device according to claim 2. [Claim 5] The rotary cylinder has positioning means for individually defining the opening adjustment position. The hot air device according to claim 2. [Claim 6] At the outer circumference of the rotary cylinder, the two inlet chambers are in contact, the boundary wall between the two inlet chambers is formed from an insulating material, and there is a sealing portion that seals the boundary wall and the outer circumference of the rotary cylinder. The hot air device according to claim 2. [Claim 7] The mixing chamber is provided with an intermediate mixing partition wall, which is arranged parallel to the partition wall and spaced apart in the longitudinal direction of the nozzle, and which forms an intermediate temperature region that averages the mixing ratio with the adjacent rotary cylinder. The hot air device according to claim 3.

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